By George Georgiopoulos and Kylie MacLellan

Updated25 May 2015 — 7:59amfirst published at 6:07am

Athens: Greece cannot make debt repayments to the International Monetary Fund next month unless it achieves a deal with creditors, its Interior Minister said on Sunday, the most explicit remarks yet from Athens about the likelihood of default if talks fail.

Shut out of bond markets and with bailout aid locked, cash-strapped Athens has been scraping state coffers to meet debt obligations and to pay wages and pensions. With its future as a member of the 19-nation euro zone potentially at stake, a second government minister accused its international lenders of subjecting it to slow and calculated torture.

Greek Prime Minister lexis Tsipras faces perilous times as the country stares down a default.Credit:Bloomberg

After four months of talks with its eurozone partners and the IMF, the leftist-led government is still scrambling for a deal that could release up to 7.2 billion euros ($7.9 billion) in aid to avert bankruptcy.

"The four instalments for the IMF in June are 1.6 billion euros. This money will not be given and is not there to be given," Interior Minister Nikos Voutsis​ told Greek Mega TV's weekend show.

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Mr Voutsis was asked about his concern over a "credit event", a term covering scenarios such as bankruptcy or default, if Athens missed a payment.

"We are not seeking this, we don't want it, it is not our strategy," he said.

"We are discussing, based on our contained optimism, that there will be a strong agreement [with lenders] so that the country will be able to breathe. This is the bet," Mr Voutsis said.

Previously, the Athens government has said it is in danger of running out of money soon without a deal, but has insisted it still plans to make all upcoming payments.

The government is under pressure to agree to more cuts and reforms to secure the funding, but opposes measures that it says make the situation worse by preventing recovery from one of the deepest recessions in modern times.

Mr Voutsis said the government was determined to fight against the lenders' strategy of "asphyxiation".

"This policy of extreme austerity and unemployment in Greece must be hit," he said. "We will not escape from this fight."

In an effort to placate the hard-left faction of his Syriza party, Greek Prime Minister Alexis Tsipras​ said on Saturday the government was on a final stretch towards a deal, but would not accept "humiliating terms".

Energy Minister Panagiotis Lafazanis​, who sides with the party's hard-left faction, told its central committee on Sunday the government must prepare the Greek people in case there is no deal in the coming days that is compatible with its promises.

"The so-called institutions in the last four months have applied a drip-feed torture on the Greek people – one of the most horrible blackmail practices in world history – at the expense of the country," he said.

He told party cadres the government must be ready for any possible alternative solution to avoid new measures and privatisations.

After two days of deliberations, the party's central committee on Sunday approved Mr Tsipras's proposed line on the negotiations – that a deal should include low primary budget surpluses, no cuts in wages and pensions, a debt restructuring and an investment programme.

The hard-left faction's call for a clash with lenders was rejected.

Finance Minister Yanis Varoufakis​ said Greece had made "enormous strides" towards reaching a deal with its lenders to avert bankruptcy but it was now up to the institutions to do their bit.

"We have met them three-quarters of the way, they need to meet us one-quarter of the way," he told Britain's BBC on Sunday.

Mr Varoufakis also said it would be "catastrophic" if Greece left the euro, predicting it would be "the beginning of the end of the common-currency project".

He said in the past four months Athens had managed to pay public-sector salaries, pensions and dues to the IMF by extracting 14 per cent of national output, doing "remarkably well" for an economy that did not have access to money markets.

"At some point, we will not be able to do it and, at some point, we are going, obviously, to have to make this choice that no minister of finance should ever have to make," Mr Varoufakis said.